IIRC tcp_crlf_ping is only about the Ping-Pong mechanism: client sends PING=CRLF, server responds with PONG=CRLFCRLF. Thus, server should only response on client CRLF. Further the PONG is always double-CRLF. So I suspected it is NAT keepalive - maybe someone added NAT-keep-alive for TCP :-) regards Klaus On 26.11.2012 11:05, Daniel-Constantin Mierla wrote: > Hello, > > this might be actually related to tcp connection keepalive: > > http://www.kamailio.org/wiki/cookbooks/3.3.x/core#tcp_crlf_ping > > IIRC, nathelper pings only udp contacts. > > Cheers, > Daniel > > On 11/26/12 10:54 AM, Klaus Darilion wrote: >> >> >> On 26.11.2012 05:13, Dmytro Bogovych wrote: >>> Greetings. >>> May anyone give me advice? >>> I have working Kamailio with TLS. >>> It is used by iOS softphone - i developed own one based on >>> resiprocate. >>> All signalling is TLS. >>> Almost everything is fine. >>> >>> But looks kamailio sends CRLF messages sometimes. >>> If it happens when softphone is in background mode - it is killed >>> by iOS >>> (as iOS prohibits too often awakes from background mode). >>> >>> How I can disable these messages? >>> I see natping_interval = 30 and ping_nated_only=0 >>> Should I set natping_interval to zero ? >> >> Either set the interval to 0 or set ping_nated_only=1 and make sure to >> not set the NAT flag for the iphone clients. >> >> A problem may be firewalls/NAT between the iPhone and Kamailio, as >> they may drop the TCP connection is there is no activity for too long >> time. >> >> regards >> Klaus >> >> _______________________________________________ >> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list >> sr-users(a)lists.sip-router.org >> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users >